Computer Simulation of a Fire-Ball

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A computer simulation is made on multiple pi-meson emission from a fire-ball under rigorous requirement of the energy-momentum conservation and basic assumptions on its physical properties, which were obtained from the superposed data of C-jets of the Chacaltaya emulsion chamber experiment. The computer constructed about one thousand examples each for cases of the fire-ball rest-mass, 2.2, 2.4, 2.6 and 2.8 GeV / c^2 with the width of 100 MeV / c^2. Further, the simulation experiment is carried out on the C-jet observation by the producer emulsion chamber under the identical conditions with the real experiment of Chacaltaya Chamber Nos. 12 and 13. Through the simulation experiment, one is able to perform detailed investigation on the fluctuation problem and the experimental biases in measurement and analysis on the individual events. Comparison of the data of artificial C-jets and of experimental C-jets provides a method of estimation of a fire-ball rest-mass. This comparison is made on distributions of the three physical quantities of the event, the γ-ray mass (total energy released into γ-rays in the fire-ball system), the invariant mass of the detected γ-rays and the γ-ray multiplicity. Those three quantities are affected in different ways by the experimental conditions, so that their mutual consistency check allows to discuss accuracy of the mass estimation and possible systematic errors in the experimental data. The conclusion from the comparison of 70 C-jet events of the Chacaltaya experiment with the artificial ones is that the fire-ball mass-value lies between 2.2 and 2.6 GeV / c^2. In addition, the present work gives suggestions on design of the experiments and method of the analysis.
理論物理学刊行会の論文
1971-09-14

Computer Simulation of a Fire-Ball

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